Issue 22521. Drop '_J2DAccessor' suffixes.

pkg/analyzer/lib/task/dart.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.task.dart;
 
 import 'package:analyzer/src/generated/ast.dart';
-import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/task/model.dart';
 
 /**
  * The analysis errors associated with a target.
  *
  * The value combines errors represented by multiple other results.
  */
@@ skipping 85 matching lines @@
 /**
  * The sources of the Dart files that a library consists of.
  *
  * The list will include the source of the defining unit and [INCLUDED_PARTS].
  * So, it is never empty or `null`.
  *
  * The result is only available for targets representing a Dart library.
  */
 final ListResultDescriptor<Source> UNITS =
     new ListResultDescriptor<Source>('UNITS', Source.EMPTY_ARRAY);